[#302] Update linter config

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

.golangci.yml

@@ -1,136 +1,54 @@
-# https://habr.com/company/roistat/blog/413175/
+# This file contains all available configuration options
-# https://github.com/golangci/golangci-lint
+# with their default values.
-linters-settings:
-  govet:
-    check-shadowing: false
-  golint:
-    # minimal confidence for issues, default is 0.8
-    min-confidence: 0.8
-  gofmt:
-    # simplify code: gofmt with `-s` option, true by default
-    simplify: true
-  gocyclo:
-    min-complexity: 30
-  maligned:
-    suggest-new: true
-  dupl:
-    threshold: 100
-  goconst:
-    min-len: 2
-    min-occurrences: 2
-  gosimple:
-  gocritic:
-    # Which checks should be enabled; can't be combined with 'disabled-checks';
-    # See https://go-critic.github.io/overview#checks-overview
-    # To check which checks are enabled run `GL_DEBUG=gocritic golangci-lint run`
-    # By default list of stable checks is used.
-#    enabled-checks:
-#      - rangeValCopy
-    # Which checks should be disabled; can't be combined with 'enabled-checks'; default is empty
-    disabled-checks:
-      - regexpMust
-    # Enable multiple checks by tags, run `GL_DEBUG=gocritic golangci-lint` run to see all tags and checks.
-    # Empty list by default. See https://github.com/go-critic/go-critic#usage -> section "Tags".
-    enabled-tags:
-      - performance
-
-    settings: # settings passed to gocritic
-      captLocal: # must be valid enabled check name
-        paramsOnly: true
-      rangeValCopy:
-        sizeThreshold: 32
-#  depguard:
-#    list-type: blacklist
-#    include-go-root: false
-#    packages:
-#      - github.com/davecgh/go-spew/spew
-  lll:
-    # max line length, lines longer will be reported. Default is 120.
-    # '\t' is counted as 1 character by default, and can be changed with the tab-width option
-    line-length: 120
-    # tab width in spaces. Default to 1.
-    tab-width: 1
-  unused:
-    # treat code as a program (not a library) and report unused exported identifiers; default is false.
-    # XXX: if you enable this setting, unused will report a lot of false-positives in text editors:
-    # if it's called for subdir of a project it can't find funcs usages. All text editor integrations
-    # with golangci-lint call it on a directory with the changed file.
-    check-exported: false
-  unparam:
-    # Inspect exported functions, default is false. Set to true if no external program/library imports your code.
-    # XXX: if you enable this setting, unparam will report a lot of false-positives in text editors:
-    # if it's called for subdir of a project it can't find external interfaces. All text editor integrations
-    # with golangci-lint call it on a directory with the changed file.
-    check-exported: false
-  nakedret:
-    # make an issue if func has more lines of code than this setting and it has naked returns; default is 30
-    max-func-lines: 30
-
-
-linters:
-  enable-all: true
-  fast: false
-  disable:
-    - gochecknoglobals
-#    - maligned
-#    - prealloc
-#  disable-all: false
-#  presets:
-#    - bugs
-#    - unused
 
 # options for analysis running
 run:
-  # default concurrency is a available CPU number
-#  concurrency: 8
-
   # timeout for analysis, e.g. 30s, 5m, default is 1m
-#  deadline: 1m
+  timeout: 5m
-
-  # exit code when at least one issue was found, default is 1
-#  issues-exit-code: 1
 
   # include test files or not, default is true
-#  tests: true
+  tests: false
-
-  # list of build tags, all linters use it. Default is empty list.
-#  build-tags:
-#    - mytag
-
-  # which dirs to skip: they won't be analyzed;
-  # can use regexp here: generated.*, regexp is applied on full path;
-  # default value is empty list, but next dirs are always skipped independently
-  # from this option's value:
-  #   	vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
-#  skip-dirs:
-#    - src/external_libs
-#    - autogenerated_by_my_lib
-
-  # which files to skip: they will be analyzed, but issues from them
-  # won't be reported. Default value is empty list, but there is
-  # no need to include all autogenerated files, we confidently recognize
-  # autogenerated files. If it's not please let us know.
-#  skip-files:
-#    - ".*\\.my\\.go$"
-#    - lib/bad.go
-
-  # by default isn't set. If set we pass it to "go list -mod={option}". From "go help modules":
-  # If invoked with -mod=readonly, the go command is disallowed from the implicit
-  # automatic updating of go.mod described above. Instead, it fails when any changes
-  # to go.mod are needed. This setting is most useful to check that go.mod does
-  # not need updates, such as in a continuous integration and testing system.
-  # If invoked with -mod=vendor, the go command assumes that the vendor
-  # directory holds the correct copies of dependencies and ignores
-  # the dependency descriptions in go.mod.
-#  modules-download-mode: readonly|release|vendor
 
 # output configuration options
 output:
   # colored-line-number|line-number|json|tab|checkstyle|code-climate, default is "colored-line-number"
   format: tab
 
-  # print lines of code with issue, default is true
+# all available settings of specific linters
-  print-issued-lines: true
+linters-settings:
+  exhaustive:
+    # indicates that switch statements are to be considered exhaustive if a
+    # 'default' case is present, even if all enum members aren't listed in the
+    # switch
+    default-signifies-exhaustive: true
+  govet:
+    # report about shadowed variables
+    check-shadowing: false
 
-  # print linter name in the end of issue text, default is true
+linters:
-  print-linter-name: true
+  enable:
+    # mandatory linters
+    - govet
+    - golint
+
+    # some default golangci-lint linters
+    - errcheck
+    - gosimple
+    - ineffassign
+    - staticcheck
+    - typecheck
+
+    # extra linters
+    - exhaustive
+    - gofmt
+    - whitespace
+    - goimports
+  disable-all: true
+  fast: false
+
+issues:
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    - path: policy/grammar\.go # ignore structtag issues there
+      linters:
+        - govet